Hay, artificially dried forages, straws and chaff

From Carpintero M C, Henderson A R and McDonald P 1979 Grass and Forage Science 34 311. 

After Watson S J and Nash M J 1960 The Conservation of Grass and Forage Crops, Edinburgh, Oliver aixl 

Adapted from MAFF 972 ADAS Science Arm Report London, FIMSO, p. 95. 

The chemical changes and losses associated with haymaking do not completely cease when hay is stored in the stack or barn. The stored crop may contain 100-300 g/kg moisture. At the higher moisture levels, chemical changes brought about by the action of plant enzymes and microorganisms are likely to occur. 

Respiration ceases at about 40 °C, but the action of thermophilic bacteria may go on up to about 72 °C. Above this temperature, chemical oxidation can cause further heating. The heat tends to accumulate in hay stored in bulk, and eventually combustion may occur. 

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Chapter 20 Hay, artificially dried forages, straws and chaff... 

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